They said the Army is in high "operational readiness", a development which comes in the wake of the deadly Uri attack in which 18 soldiers were killed.
"We have achieved an operational posture which will allow us to exercise various military options at a short notice," the sources said.
Troop positions along the LoC have been reinforced and gun positions "moved". The posture remains dynamic which means it keeps changing, the sources said.
Pakistan has closed down its airspace over PoK without giving any reasons.